function switch_language()
{
    var this_domain = document.domain;
    var qo = getQueryObject();
    
    if (qo.lang == "fr")
    {
        window.location = "http://" + this_domain + "?lang=en";
    }
    else
    {
        window.location = "http://" + this_domain + "?lang=fr";
    }
}